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Significance of Perylene for Source Allocation of Terrigenous Organic Matter in Aquatic Sediments

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Significance of Perylene for Source Allocation of Terrigenous Organic Matter in Aquatic Sediments Article Cite This: Environ. Sci. Technol. 2019, 53, 8244−8251 pubs.acs.org/est Significance of Perylene for Source Allocation of Terrigenous Organic Matter in Aquatic Sediments † † ∥ † ‡ § † Ulrich M. Hanke,*, Ana L. Lima-Braun, , Timothy I. Eglinton, , Jeffrey P. Donnelly, Valier Galy, † ⊥ † § § † Pascale Poussart, , Konrad Hughen, Ann P. McNichol, Li Xu, and Christopher M. Reddy † Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, Massachusetts 02543, United States ‡ Geological Institute, ETH Zürich, Sonneggstrasse 5, 8092 Zurich, Switzerland § Department of Geology and Geophysics, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, Massachusetts 02543, United States *S Supporting Information ABSTRACT: Perylene is a frequently abundant, and some- times the only polycyclic aromatic hydrocarbon (PAH) in aquatic sediments, but its origin has been subject of a longstanding debate in geochemical research and pollutant forensics because its historical record differs markedly from typical anthropogenic PAHs. Here we investigate whether perylene serves as a source-specific molecular marker of fungal activity in forest soils. We use a well-characterized sedimentary record (1735−1999) from the anoxic-bottom waters of the Pettaquamscutt River basin, RI to examine mass accumulation rates and isotope records of perylene, and compare them with total organic carbon and the anthropogenic PAH fluoranthene. We support our arguments with radiocarbon (14C) data of higher plant leaf-wax n-alkanoic acids. Isotope-mass balance-calculations of perylene and n-alkanoic acids indicate that ∼40% of sedimentary organic matter is of terrestrial origin. Further, both terrestrial markers are pre-aged on millennial time-scales prior to burial in sediments and are insensitive to elevated 14C concentrations following nuclear weapons testing in the mid-20th Century. Instead, changes coincide with enhanced erosional flux during urban sprawl. These findings suggest that perylene is definitely a product of soil-derived fungi, and a powerful chemical tracer to study the spatial and temporal connectivity between terrestrial and aquatic environments. ■ INTRODUCTION determined that the fungal species Cenococcum geophillum Downloaded via MBLWHOI LIBRARY on December 1, 2020 at 16:47:21 (UTC). 1−5 6−8 produces 4,9-dihydroxyperylene-3,10-quinone, confirming a Perylene is found in marine and lacustrine sediments, 1,22 soils,9,10 and also petroleum11,12 and fuel emissions13,14 often longstanding hypothesis that there is a naturally produced precursor. This ectomycorrhizal fungus appears almost ubiq- See https://pubs.acs.org/sharingguidelines for options on how to legitimately share published articles. associated with other distinctive anthropogenic combustion- derived polycyclic aromatic hydrocarbons (PAHs). However, uitous in boreal, temperate, and subtropical regions, and most studies report that sediment records of perylene differ is present in the rhizosphere of woody-plant roots and more − 26 greatly from those of anthropogenic PAHs.15 19 The latter are generally in forest soils. A fungal origin can explain the typically most abundant in sediments post-dating the Industrial widespread abundance of perylene in the environment even over 27 Revolution, particularly those deposited during the latter half of geological time-scales, since mycorrhizal associations with 28 the 20th Century, whereas perylene abundances are lowest near vascular plants evolved about 400 million years ago. the sediment−water interface and tend to increase with depth, Besides C. geophyllum, other mycorrhiza also produce similar 29,30 particularly in anoxic sedimentary settings.18,20 This depth- perylene precursor compounds as toxins involved in 31 related increase in concentration implies abiotic or biologically pathogenesis of their host plant. Prior stable carbon isotopic mediated in situ production from precursor natural prod- (δ13C) measurements of perylene found values similar to those 2,21 δ13 ≈− ‰ uct(s) by either a first- or second-order reaction under of terrestrial sources (C3-vegetation: C 27 ), anaerobic conditions.20 The origin of perylene has remained unclear for decades, Received: April 17, 2019 1,2,22,23 during which has previously been argued for terrestrial Revised: June 11, 2019 and diagenetic,6,16,24 as well as petrogenic12,25 and pyrogen- Accepted: June 19, 2019 ic13,14 sources. It was only recently that Itoh and collaborators23 Published: June 19, 2019 © 2019 American Chemical Society 8244 DOI: 10.1021/acs.est.9b02344 Environ. Sci. Technol. 2019, 53, 8244−8251 Environmental Science & Technology Article supporting a wood-degrading origin from the rhizosphere.32 (41.503100; −71.450500) in 1999. The catchment area covers This is further supported by dual-isotope analyses of perylene 35 km2 of forest, wetlands and open water of which today about (δ13C and δD) in sediments showing similar δD values as 30% is residential land.37 Ocean water flooded the basin about methoxy groups in lignin while δ13C values are consistent with 1700 ± 300 years ago leading to a stratified water column and the expected fractionation range in saprophytic fungi.22 In sustained anoxic conditions in bottom waters and underlying addition, natural abundance radiocarbon (14C) analyses allows a sediments.36 A detailed description on the sediment chronology comparison of the 14C age of perylene with that of other organic and sample processing is presented elsewhere.15,39 Sediment matter constituents,25 including total organic carbon (TOC) chronology was obtained fromvarvecountingofX-ray and specific markers of terrigenous organic matter co-deposited radiographs as well as from 137Cs and 210Pb profiles using the in aquatic sediments. Such analyses shed light on the origin and model of constant rate of supply that yielded a sequence of about provide further evidence on the origin of perylene and its use in 260 years (1735−1999 AD) and an average sedimentation rate environmental forensics. of 0.44 ± 0.10 cm yr−1.39 Our motivation is to reconcile existing hypotheses on the Sections from the cores were combined after aligning x- source of perylene and assess the potential of this marker radiograph images including hurricane layers in 1938 and 1954 compound as a biogeochemical tracer to follow the trajectories to a reference chronology of varve counting, 210Pb, and 137Cs. of terrigenous organic matter mobilization and transport within This was necessary to obtain enough sediment for trace fi 35 watersheds. Speci cally, we investigate whether it serves as a molecular isotopic-analyses. Hence, we pooled the samples molecular marker for rhizosphere carbon from catchment soils in eight horizons for all isotopic analyses: H1 (1999−1982), H2 and thus facilitates source approximation of terrigenous organic (1981−1962), H3 (1960−1931), H4 (1929−1898), and H5 matter in sediments. Moreover, while researchers currently tend (1896−1873), H6 (1871−1842), H7 (1840−1768), and H8 to exclude perylene from forensic investigations involving the (1764−1735), respectively, except n-alkanoic acids that were apportionment of PAHs due to its incongruent behavior, analyzed in four individual samples: 1885 ± 5, 1947 ± 33, 1972 ff 33,34 perylene may have mutagenic e ects on organisms. Thus, an ± 2, and 1991 ± 1. Quantitative measurements for the improved understanding of the provenance and dynamics of calculation of the mass accumulation rates as well as grain size perylene may be pertinent to mapping inventories of natural and analyses were performed on individual samples as well. anthropogenic pollutants, delineating transport pathways, and Grain Size Analyses. One freeze-core slab was subsectioned reconstructing historical land-use. using a scalpel blade, transferred into 50 mL round-bottom In this study, we construct historical records of perylene and flasks and treated with a 30% hydrogen peroxide solution at a TOC abundances and isotope compositions from the anoxic ratio of 40 mL per 1 g sediment, and heated in a water bath to 70 sediments of the suburban Pettaquamscutt River basin, RI. We °C as a means to support mineralization of the organic matter. chose these sediments because they provide an exceptionally Subsequently, samples were freeze-dried, and a subsample of detailed chronological record and a wealth of background about 11 mg was suspended in water and measured on a information on the catchment area, including human influence − Beckmann Coulter LS13 320 laser diffraction particle analyzer on local to regional scales.15,35 38 In addition, this sedimentary (Indianapolis, IN) in triplicate. record extends over 260 years, from the preindustrial (∼1735) Total Organic Carbon and Nitrogen. A Fisons 1108 until 1999, including an interval characterized by frequent elemental analyzer was used to measure the TOC content of the above-ground nuclear-bomb testing (resulting in elevated samples. To remove the inorganic carbon fraction, about 2 mg of atmospheric 14C concentrations peaking in 1963 when the dry sample was weighed into a silver capsule and acidified with testing ceased), thus offering the opportunity to study the rate at 20 μL of 2 N HCl. TOC content was calculated in relation to the which specific organic carbon species incorporate atmospheric whole sediment dry weight while organic carbon/organic CO2 and are sequestered in aquatic sediments. These character- istics of the study site, when coupled with down-core δ13C and nitrogen TOC/TN ratios were calculated
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